What is a HEIC file? How it compares with JPG

A HEIC file is a photo that an iPhone saves in Apple's HEIF format instead of as a JPG. Apple devices open it without any setup, while Windows needs two add-ons from the Microsoft Store before it can show one.

The .heic ending often surfaces this way: a photo that looked fine on the phone shows nothing on a PC, or an upload form turns it away. Whether the photo needs converting depends on where it has to go, and for many photos the answer is that it does not.

What is a HEIC file? The format and what the name means

It is an iPhone photo stored in Apple's HEIF, a newer way of saving pictures that takes less storage space than the older JPEG. .heic is the extension of photos stored in HEIF, which Apple names High Efficiency Image File Format. Support arrived in iOS 11 and macOS High Sierra 10.13, and an iPhone 7 or iPhone 7 Plus or later captures photos in HEIF.

Whether new photos come out as HEIF depends on the iPhone camera's Formats setting. High Efficiency saves new shots as HEIF, and Most Compatible switches the camera back to JPEG.

Apple's support page never spells out the letters in HEIC, so the safe name to search for is HEIF. Windows, for one, lists its add-on as HEIF Image Extension rather than under any HEIC name.

HEIC vs JPG: the differences Apple and Microsoft document

The vendors' own pages support a short comparison, and it comes down to space against reach. "HEIC and JPG compared" lists only what Apple and Microsoft state.

HEIC and JPG compared

HEIC buys storage, and JPG buys reach. Because Apple states the visual quality as the same for both, quality is not what separates them; space and reach are. Apple treats JPG as the fallback in its own camera setting and in its sharing behavior, so when a HEIC photo cannot go somewhere as it is, JPEG is the format Apple names for the swap.

The Windows row is the one most likely to cause trouble. A HEIC photo needs two separate Store packages before it displays, and the second of them is a video package rather than an image one. For a wider comparison of formats, see Image file formats: 9 types and when to use each.

Why a HEIC file takes up less space than a JPG

Compression is Apple's stated reason, and the saving shows up in storage rather than in how the picture looks. Apple says HEIF and HEVC offer better compression than JPEG and H.264, so they use less storage space on devices and iCloud Photos while keeping the same visual quality.

Apple publishes no size ratio. The reliable test is to export one of your own HEIC photos as JPG and compare the two sizes, because a figure measured on another person's photo says little about your own library.

The saving lasts only while the photo stays HEIC. An automatic fallback when sharing, a USB import that converts, or a JPG you export yourself gives the space back for that copy. For ways to shrink a JPG further, see Reduce image file size without losing quality.

Where a HEIC file opens and where it doesn't

Apple platforms read the format natively, so the trouble starts on Windows and in upload or print forms. Apple builds HEIF support into iOS 11 and later, iPadOS, visionOS and macOS High Sierra 10.13 and later. Elsewhere, whether the photo opens depends on what the other system has installed or accepts.

Opening a HEIC file on Windows with HEIF Image Extension

A free add-on alone is not enough, because Microsoft requires a second package before a PC shows the photo. HEIF Image Extension lets Windows read and write HEIF files, and the Microsoft Store lists it as free. The same listing says HEVC Video Extensions must also be installed to view images in files ending .heic, .hif or .heif, while .avif files need the AV1 Video Extension.

So viewing a single photo depends on a video package. If a .heic file shows nothing after the first install, the missing HEVC package is the first thing to check. The listing states no price for HEVC Video Extensions, so read it before assuming that the package is free too.

Uploading and printing HEIC photos

Each upload form and print service sets its own list of accepted types, so the label beside the button is the only reliable answer. Read the accepted-formats line next to the upload button or in the order form. If it names JPG, JPEG or PNG but not HEIC or HEIF, treat the photo as unsupported and convert it first.

Do not count on the iPhone to convert for you here. The iPhone's automatic JPEG fallback applies to sharing by AirDrop, Messages or email. Apple has announced no such conversion for upload forms or print orders.

Picking a HEIC viewer: opening the file without converting

Apple devices need nothing extra and a Windows PC needs two Microsoft packages, which keeps the photo at its smaller size. On an iPhone, iPad or Mac, Photos opens the photo, and on a Mac so does Preview. Apple builds HEIF support into these systems, so they handle it the way they handle a JPG.

On Windows, a HEIC viewer means installing HEIF Image Extension and HEVC Video Extensions from the Microsoft Store. Once both are in place Windows reads the photo directly, and because nothing was converted, the photo keeps its smaller size.

When searching the Store, check the publisher name before installing. The HEIF Image Extension listing shows Microsoft Windows as the publisher and System Components as the category, which sets it apart from third-party apps with similar names.

When you need to convert a HEIC file to JPG

A photo has to change form only when its destination refuses it and that destination cannot be changed. Four cases come up in practice, and each one is a destination that refuses the file:

• A Windows PC where the two packages cannot be installed
• An upload form or print order whose accepted formats leave out HEIC and HEIF
• Editing software whose list of supported formats does not include HEIC or HEIF
• A photo handed over outside Messages, AirDrop and email, such as a shared cloud folder, to someone without an Apple device

On a PC you own, installing the two packages is a one-time job per device, and every photo opens afterward. Converting costs an export for each photo, so the effort grows with the number of photos. A large library on your own PC is a case for installing, while a single photo or someone else's machine is a case for converting.

Sending from an iPhone through Messages, AirDrop or email usually needs no conversion, because Apple says the photo might go out as JPEG when the receiving device cannot read HEIF. Apple's word is "might", so if the other person still cannot open the photo, convert it and send it again. iCloud Photos keeps the original format, which suits other Apple users but not a Windows PC without the extensions.

To stop producing HEIC in the first place, set the camera's Formats setting to Most Compatible. All new photos then use JPEG or H.264, and the price is the storage saving for as long as the setting stays on.

Converting a HEIC file to JPG on a Mac or in the browser

Apple's export menu writes a new copy without touching the original, and a web converter handles PCs without an install. In Photos or Preview on a Mac, open the HEIF image and use the Export command to pick a format such as JPEG or PNG before saving.

The iPhone and iPad have no announced JPEG export of their own. A USB import into Photos, Image Capture or a PC might convert the media to JPEG, and the Keep Originals setting for Photos prevents that conversion.

For a HEIC photo already on a PC, the Sokufu HEIC to JPG/PNG/WebP Converter converts each file on your own device, so the photo is never uploaded. It takes several files at once and returns them as one ZIP, and it writes JPG, PNG or WebP.

JPG and WebP come with quality presets, while PNG has none because it is lossless and the file comes out larger. There is no sign-up and no daily limit.

Summary: keep HEIC, convert only where it is refused

One rule settles the whole question: leave the photo alone where it already opens, and make a copy only for the places that turn it away. Apple's documented fallback to JPEG covers AirDrop, Messages and email, so those routes rarely need a manual conversion. For everything else, the right move depends on where the photo is going:

• Apple devices only: leave them as HEIC, because Photos and Preview open them and the smaller size is kept.
• Your own Windows PC with many photos: install HEIF Image Extension and HEVC Video Extensions once, from the publisher Microsoft Windows.
• A PC that cannot take the packages, or a form that does not list HEIC: convert the photo to JPG.
• No wish to produce HEIC at all: switch the camera to Most Compatible and accept the loss of the storage saving.